Letteratura scientifica selezionata sul tema "Thia-Michael"
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Articoli di riviste sul tema "Thia-Michael"
Berne, Dimitri, Vincent Ladmiral, Eric Leclerc e Sylvain Caillol. "Thia-Michael Reaction: The Route to Promising Covalent Adaptable Networks". Polymers 14, n. 20 (21 ottobre 2022): 4457. http://dx.doi.org/10.3390/polym14204457.
Testo completoGuha, Chayan, Nayim Sepay, Tapas Halder e Asok Mallik. "Remarkable Diastereoselectivity of the Thia-Michael Reaction on α,α′-Di[(E)-benzylidene]alkanones: Exclusive Formation of a meso Product". Synlett 29, n. 09 (22 marzo 2018): 1161–66. http://dx.doi.org/10.1055/s-0036-1591961.
Testo completoWessig, Pablo, Tanja Schulze, Alexandra Pfennig, Steffen M. Weidner, Sascha Prentzel e Helmut Schlaad. "Thiol–ene polymerization of oligospiroketal rods". Polymer Chemistry 8, n. 44 (2017): 6879–85. http://dx.doi.org/10.1039/c7py01569k.
Testo completoLin, Ya-mei, Guo-ping Lu, Chun Cai e Wen-bin Yi. "An odorless thia-Michael addition using Bunte salts as thiol surrogates". RSC Advances 5, n. 34 (2015): 27107–11. http://dx.doi.org/10.1039/c5ra01381j.
Testo completoHerbert, Katie M., Patrick T. Getty, Neil D. Dolinski, Jerald E. Hertzog, Derek de Jong, James H. Lettow, Joy Romulus, Jonathan W. Onorato, Elizabeth M. Foster e Stuart J. Rowan. "Dynamic reaction-induced phase separation in tunable, adaptive covalent networks". Chemical Science 11, n. 19 (2020): 5028–36. http://dx.doi.org/10.1039/d0sc00605j.
Testo completoBosica, Giovanna, Roderick Abdilla e Alessio Petrellini. "Thia-Michael Reaction under Heterogeneous Catalysis". Organics 4, n. 1 (21 febbraio 2023): 86–96. http://dx.doi.org/10.3390/org4010007.
Testo completoQiu, Lin, Zhongqing Wen, Yuling Li, Kai Tian, Youchao Deng, Ben Shen, Yanwen Duan e Yong Huang. "Stereoselective functionalization of platensimycin and platencin by sulfa-Michael/aldol reactions". Organic & Biomolecular Chemistry 17, n. 17 (2019): 4261–72. http://dx.doi.org/10.1039/c9ob00324j.
Testo completoHayama, Noboru, Yusuke Kobayashi, Eriko Sekimoto, Anna Miyazaki, Kiyofumi Inamoto, Tetsutaro Kimachi e Yoshiji Takemoto. "A solvent-dependent chirality-switchable thia-Michael addition to α,β-unsaturated carboxylic acids using a chiral multifunctional thiourea catalyst". Chemical Science 11, n. 21 (2020): 5572–76. http://dx.doi.org/10.1039/d0sc01729a.
Testo completoMostardeiro, Vitor B., Marina C. Dilelio, Teodoro S. Kaufman e Claudio C. Silveira. "Efficient synthesis of 4-sulfanylcoumarins from 3-bromo-coumarins via a highly selective DABCO-mediated one-pot thia-Michael addition/elimination process". RSC Advances 10, n. 1 (2020): 482–91. http://dx.doi.org/10.1039/c9ra09545d.
Testo completoJain, Anshul, Sushobhan Maji, Khyati Shukla, Akanksha Kumari, Shivani Garg, Ramesh K. Metre, Sudipta Bhattacharyya e Nirmal K. Rana. "Stereoselective synthesis of tri-substituted tetrahydrothiophenes and their in silico binding against mycobacterial protein tyrosine phosphatase B". Organic & Biomolecular Chemistry 20, n. 15 (2022): 3124–35. http://dx.doi.org/10.1039/d2ob00052k.
Testo completoTesi sul tema "Thia-Michael"
Genty, Axelle. "Synthèse stéréοsélective d’hétérοcycles azοtés par réactiοns mοnοtοpes dοminο". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMLH30.
Testo completoNitrogen-containing heterocycles are particularly prominent in medicinal and pharmaceutical chemistry. δ-Lactams, in particular, are experiencing increasing interest due to their significant biological relevance and their use as reactive intermediates for the synthesis of valuable molecules. The growing interest of these compounds drives the search for new synthetic routes to access these polyfunctional motifs. Monotope reactions stand out as a favored strategy, enabling the formation of multiple bonds and stereogenic centers within a molecule in a single one, while avoiding the purification of reaction intermediates. Our team has specialized in these monotope approaches for the synthesis of γ- and δ-lactams. In this manuscript, we aim to exploit the trivalent reactivity of N-alkoxyacrylamides to develop a new synthetic methodology. Thus, a sequenced monotope reaction of aza-Michael/thia-Michael/diastereoselective aldolization was performed based on the prior optimization of a domino thia-Michael/aldolization reaction. The range of nucleophiles capable of performing this reaction sequence proved to be more limited than expected, with only thiophenol derivatives showing particular promise. During the modulation of these compounds, we added an in situ silylation step prior to the sequence, allowing for a sequenced one-pot process of silylation/thia-Michael/diastereoselective aldolization. Subsequently, applications to access benzothiazepines, motifs with numerous biological interests, were undertaken. Furthermore, two asymmetric organocatalytic variants of the cascade were considered to access enantioenriched δ-lactams. The first approach involving the previously developed enantioselective aza-Michael reaction as a first stepproved succesful. The second approach, relying on the use of chiral organocatalysts in the diastereo- and enantioselective thia-Michael/aldolization sequence, is still under development
Li, Mao. "Iron(III) catalyzed asymmetric Diels-Alder reaction - Iron(II) catalyzed thia-Michael addition and aldehyde allylation reactions". Doctoral thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/34969.
Testo completoIron catalysts are employed in three different organic transformations owing to their advantages: environmental friendliness, being less expensive and abundant on the Earth. The first project deals with asymmetric Diels-Alder reactions of α, β-unsaturated oxazolidin-2-one derivatives catalyzed by Fe¹¹¹ and a chiral bipyridine ligand. In order to obtain the optimized reaction conditions, we screened different solvents, catalyst loading, various reaction times and a variety of iron salts such as Fe(ClO₄)₂·6H₂O, Fe(ClO₄)₂·6H₂O, Fe(OTf)₃, Fe(OTf)₂, FeCl₂, FeCl₃, FeBr₃ and FeI₃. As a result, the reaction between cyclopentadiene and 3-alkenoyl-1,3-oxazolidin-2-one was carried out at –30 °C in CH₃CN in 1.5 h, with Fe(ClO₄)₃·6H₂O (2 mol%) complexed with the chiral bipyridine ligand (2.4 mol%) as catalyst, providing an excellent yield (99%) and an excellent enantiomeric excess (98%). Decreased enantioselectivities were observed for less-reactive dienes. Overall, less than 10 mol% of catalyst loading was employed. The great advantages of this project are the mild reaction temperature, very low catalyst loading, excellent yields and enantioselectivities and the applicability to a wide scope of substrates. Meanwhile, iron catalysts were used in thia-Michael additions by two different approaches. The first one is about thia-Michael additions catalyzed by Fe(OTf)₂ in EtOH at room temperature. This green method allows the thia-Michael additions to be catalyzed by a green iron salt (5 mol% of Fe(OTf)₂), a green and commonly used solvent EtOH at room temperature under ambient atmosphere. The generality of this reaction was demonstrated by applying it to different Michael acceptors, and to aromatic and aliphatic thiols. The second method is about thia-Michael additions catalyzed by Fe(OTf)₂ in 2-Me-THF, which is in agreement with the green chemistry principles by using a green Fe(OTf)₂ and a green solvent 2-Me-THF at room temperature or 50 °C under air atmosphere. The last project is about asymmetric allylation reactions catalyzed by Fe(OTf)₂ using a chiral ligand. With the study of a variety of chiral ligands, we selected 5 mol% of Fe(OTf)₂ and 6 mol% of Pybox ligand which catalyzed the reaction in good yield (70%) and 32% of ee. The utilization of 20 mol% of TMSCl is essential for the effectiveness of the reaction
Nocentini, Benedetta. "Indagine su reazioni di sulfa-Michael di interesse in campo cosmetologico e sul trattamento ricostruttore del capello". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15849/.
Testo completoGuerre, Marc. "Synthèse et Auto-assemblage de Copolymères Fluorés Amphiphiles Deeper insight into the MADIX Polymerization of Vinylidene Fluoride A Journey into the Microstructure of PVDF Made by RAFT Limits of vinylidene Fluoride RAFT Polymerization One-pot Synthesis of Poly(Vinylidene Fluoride) Methacrylate Macromonomer via thia-Michael addition RAFT synthesis of well-defined PVDF-b-PVAc block copolymers Combination of cationic and radical RAFT polymerization: A versatile route to well-defined poly(vinyl ethyl ether)-block-poly(vinylidene fluoride) block copolymers Amphiphilic poly(vinylidene fluoride)-b-poly(vinyl alcohol) block copolymer: Synthesis and Self-Assembly in water Polymerization-induced Self-Assembly of PVAc-b-PVDF block copolymers via RAFT dispersion polymerization of VDF in dimethylcarbonate". Thesis, Montpellier, Ecole nationale supérieure de chimie, 2017. http://www.theses.fr/2017ENCM0006.
Testo completoFluoropolymers constitute a specific class of polymers, with remarkable properties (high resistance to chemicals and heat, ferroelectricity and piezoelectricity for semi-crystalline polymers, to name a few). Fluoropolymers have found many industrial applications. However, fluoropolymers have not yet attracted all the interest they deserve from the scientific community. It is indeed difficult to prepare well-defined fluorinated polymeric architectures. The synthesis techniques developed and used so far allow the preparation of interesting architectures, but they suffer from two major drawbacks: 1) They do not allow access to high molar mass, and 2) The resulting architectures are ill-defined. As a result, physical chemistry studies of the phase segregation phenomena in films or in the bulk, or of the crystallization of fluorinated polymers were for the most part limited to homopolymers and blends. Similarly, very few studies of the self-assembly in solution of fluorinated polymeric architectures have been reported. Throughout deeper kinetic study, NMR characterizations and DFT calculation, this study reveals the remarkable efficiency of the RAFT polymerization to synthesize well-defined PVDF–based architectures. Self-assembly of PVDF-b-PVA block copolymers as well as polymerization-induced self-assembly of PVAc-b-PVDF block copolymers led to the first crystalline core/shell and desert-rose PVDF-based nanostructures
Chiang, Chien-Wei, e 江建緯. "C2-Symmetric Proline-Derivative Nickel Complexes for Mimicking the Functional Model of Nickel Superoxide Dismutase and Their Application for thia-Michael Addition". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/41634518463801219304.
Testo completo國立臺灣師範大學
化學系
101
Nickel-containing superoxide dismutase (NiSOD), has been discovered recently from Streptomyces species and marine cyanobacteria. NiSOD can catalyze the dismutation of O2− into O2 and H2O2 through a cycle of Ni(II) and Ni(III) oxidation states. In order to mimic the fuction of the active site of the NiSOD, a series of pentadentate ligands equipped with pyridine and proline derivatives have been designed and prepared. The prepared ligand, for instance 2,6-bis(((S)-2-(diphenylhydroxymethyl)-1-pyrrolidinyl)methyl)pyridine (H2BDPP), was deprotonated and employed to react with [Ni(CH3CN)6](ClO4)2 to give fivecoordinate Ni(BDPP) (5). Complex 5 can be readily oxidized by [Cp2Fe]PF6 at room temperature to form a stable Ni(III) complex, [Ni(BDPP)](PF6) (6). Complexes 5 and 6 were characterized by UV/vis spectroscopy, X-ray crystallography and cyclic voltammetry. Importantly, complex 6 can oxidized O2− to form O2, and its EPR spectrum is similar to that of the oxidaized form of NiSOD. In addition, direct reaction of H2BDPP reacted with Ni(BF4)2 and t-butylisocyanide gave six-coordinate [Ni(H2BDPP)(tBuNC)](BF4)2 (7), which exhibited the function of NiSOD. The reaction of 7 with KO2 released O2 gas, detected by GC, and generated H2O2, confirmed by peroxide test paper, peroxide indicator (LCV) and NMR spectroscopy.To enhance the water solubility and the electron donating ability of the NiSOD mimics, we designed and synthesized complexes 10, 11 and 14 with a hydroxy or methoxytriglycol (OTEG) group on the 4-position of pyrrolidine, and complexes 12 and 13 with a methoxyl and trimethylsilyl group on the para-position of four phenyl rings, respectively. On the other hand, two complexes, [Ni(BMePP)(CH3CN)](ClO4)2(15) and [Ni(BiPrPP)(CH3CN)](ClO4)(BPh4) (16) were synthesized (where BRPP =2,6-bis(((S)-2-(alkyloxycarbonyl)-1-pyrrolidinyl)methyl)pyridine), Me = methyl, iPr= isopropyl), and they can be employed as a catalyst for thia-Michael addition of thiols to α,β-enones. Notably, complex 15 possesses an excellent catalytic ability for thia-Michael reaction and gives good yields for 1,4-adducts.
Huang, Hsin‐Yi, e 黃馨誼. "(1) Sequential Yb(OTf)3 Catalyzed One-Pot Three-Component Thia-Michael Addition(2) p-Toluenesulfonic Acid Catalyzed N-Formylation of N-Formylimide with Amine in Water". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5q3k22.
Testo completo國立中興大學
化學系所
106
In the first part of this thesis, we report the three-component one-pot reaction of thia-Michael additions by using Yb(OTf)3. Compared with traditional work, thia-Michael addition comes from commercially available thiols and α,β-unsaturated compounds in alkaline condition, however, the starting material of thiols have some disadvantages, including smelly odor and easily oxidized to disulfide bond. In order to improve this situation, the reactions conducted under organic halides conditions have been reported. Herein, we report a new synthetic method that produces carbon-sulfur bonds from thiolate salt, organic halides and α,β-unsaturated compounds in mild condition. The three-component one-pot reaction of thia-Michael additions are using potassium thioacetate as the thiol source for nucleophilic substitution reaction, followed by Yb(OTf)3-catalyzed sequential S-deacetylation and thia-Michael addition. This entire route of the Yb(OTf)3 catalyzed multicomponent reactions are operational simplicity, good yield of products and use of relatively low or nontoxic reagents. The second part of the thesis, we have developed a new synthetic method for N-formylation of amines in water. Compared with the literature, we performed this reaction under metal- and gas-free conditions and prevented using high equivalent reagents from making the large scale of chemical wastes. The strategy was focused on N-formylation of amines with N-formylimides, which was prepared from amidines under p-toluenesulfonic acid catalyzed conditions. Furthermore, the N-formylation of N-formylimide has a good chemoseletivity on amino functional group. Additionally, the starting material of benzamide can be recovered after the entire reactions. Therefore, this synthetic method for N-formylation in water by using N-formylimide as an N-formylating reagent was an environmentally friendly approach.
Atti di convegni sul tema "Thia-Michael"
Movassagh, Barahman, e Ali Yousefi. "Magnetite (Fe3O4) Nanoparticles: An Efficient and Reusable Catalyst for the Synthesis of Thioethers, Vinyl Thioethers, Thiol Esters, and Thia-Michael Adducts under Solvent-Free Condition". In The 17th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2013. http://dx.doi.org/10.3390/ecsoc-17-a018.
Testo completo